1 ifneq ($(shell uname -m), i386)

2 ccemu = -m32

3

4 ifeq ($(shell uname -s), FreeBSD)

5 ldemu = -m elf_i386_fbsd

6 else

7 ldemu = -m elf_i386

8 endif

9 endif

10

11 # collect all of our C and assembly source files

12 csrc = $(wildcard src/boot/*.c) $(wildcard src/*.c) $(wildcard src/klibc/*.c)

13 asmsrc = $(wildcard src/boot/*.S) $(wildcard src/*.S) $(wildcard src/klibc/*.S)

14 dep = $(asmsrc:.S=.d) $(csrc:.c=.d)

15

16 # each source file will generate one object file

17 obj = $(asmsrc:.S=.o) $(csrc:.c=.o)

18

19 CC = gcc

20

21 inc = -Isrc -Isrc/klibc -Isrc/boot

22

23 # -nostdinc instructs the compiler to ignore standard include directories

24 # -m32 instructs the compiler to produce 32bit code (in case we have a 64bit compiler)

25 CFLAGS = $(ccemu) -Wall -g -nostdinc -fno-builtin $(inc)

26 ASFLAGS = $(ccemu) -g -nostdinc -fno-builtin $(inc)

27

28 bin = kernel.elf

29

30 # default target: make an ELF binary by linking the object files

31 # we need to specify where to assume the text section (code) is going

32 # in memory, as well as the kernel entry point (kentry).

33 $(bin): $(obj)

34 ld $(ldemu) -o $@ -Ttext 0x100000 -e kentry $(obj) -Map link.map

35

36 %.s: %.c

37 $(CC) $(CFLAGS) -S -o $@ $<

38

39 -include $(dep)

40

41 %.d: %.c

42 @$(CPP) $(CFLAGS) -MM -MT $(@:.d=.o) $< >$@

43

44 %.d: %.S

45 @$(CPP) $(ASFLAGS) -MM -MT $(@:.d=.o) $< >$@

46

47 .PHONY: clean

48 clean:

49 rm -f $(obj) $(bin)

50

51 .PHONY: cleandep

52 cleandep:

53 rm -f $(dep)